CN104330704A - Transmission and distribution power grid fault positioning system - Google Patents
Transmission and distribution power grid fault positioning system Download PDFInfo
- Publication number
- CN104330704A CN104330704A CN201410638529.6A CN201410638529A CN104330704A CN 104330704 A CN104330704 A CN 104330704A CN 201410638529 A CN201410638529 A CN 201410638529A CN 104330704 A CN104330704 A CN 104330704A
- Authority
- CN
- China
- Prior art keywords
- communication module
- transmission
- data processing
- processing module
- harvester
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
Landscapes
- Locating Faults (AREA)
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
Abstract
The invention discloses a transmission and distribution power grid fault positioning system and relates to the technical field of electrical power systems. The transmission and distribution power grid fault positioning system aims at solving the technical problem of monitoring a power transmission line and comprises a positioning terminal, a plurality of ground connection collection devices, a plurality of device collection devices, a plurality of line collection devices and a plurality of arrester current collection devices; the ground connection devices are used for collecting current signals of ground connection lines of a main transformer of a transmission and distribution power grid; the device collecting devices are used for collecting voltage signals and current signals of power distribution devices of the transmission and distribution power grid; the line collection devices are used for collecting current signals of three-phase power transmission lines of the transmission and distribution power grid; the arrester current collection devices are used for collecting current signals of transmission and distribution power grid arresters; the arrester current collection devices and the peripheral line collecting devices are mutually connected through a radio frequency communication mode; the positioning terminal, the ground connection collection devices and the line connection devices are connected to the same Ethernet. The transmission and distribution power grid fault positioning system is applicable to transmission and distribution power grid monitoring and fault positioning.
Description
Technical field
The present invention relates to power system technology, particularly relate to a kind of technology of transmission and distribution network fault location system.
Background technology
In electric system, when transmission line of electricity breaks down, need to find out fault origination point in time and repair faulty line, to recover normal power supply.
Existing transmission line malfunction monitoring method is: on transmission line of electricity, arrange a monitoring node at interval of certain distance, and at each monitoring node, an accident indicator is installed, accident indicator is provided with indicator, when monitoring node is in normal transmission state, the normal look of indicator for displaying (such as white) of accident indicator, when belonging to monitoring node during part of path generation power transmission failure, the waming color (such as red) that the indicator for displaying of accident indicator is eye-catching, tour personnel judge the operating mode of part of path belonging to monitoring node by the color shown by the indicator of observing accident indicator.This transmission line malfunction monitoring method needs to drop into a large amount of manpower burst looking up the fault nodes, and the search efficiency of malfunctioning node is low, and searching of malfunctioning node is consuming time also longer, and after transmission line of electricity is broken down, accident impact is comparatively large, and power off time is longer.
Summary of the invention
For the defect existed in above-mentioned prior art, technical matters to be solved by this invention is to provide one can improve malfunctioning node search efficiency, reduces malfunctioning node and searches the time, reduce the transmission and distribution network fault location system of the human input amount of looking up the fault.
In order to solve the problems of the technologies described above, a kind of transmission and distribution network fault location system provided by the present invention, it is characterized in that: comprise locating terminal, and multiple ground connection harvester, multiple equipment harvester, multiple circuit harvester, multiple lightning arrester current collecting device;
Described ground connection harvester comprises ground connection data processing module, and for gathering the ground current mutual inductor of current signal on ground path, for connecting the wireless communication module of Ethernet, ground connection data processing module is wherein interconnected by the wireless communication module of data line and this device, ground connection data processing module has data acquisition port, the output port of ground current mutual inductor receives the data acquisition port of this device ground connection data processing module, and the ground current mutual inductor of each ground connection harvester is arranged on each main-transformer ground path of transmission and distribution network respectively;
Described equipment harvester comprises device data processing module, radio-frequency communication module, and for the device current mutual inductor of collecting device line current signal, for connecting the wireless communication module of Ethernet, device data processing module is wherein interconnected by the wireless communication module of data line and this device, radio-frequency communication module is interconnected by the wireless communication module of data line and this device, device data processing module has voltage data and gathers port and current data collection port, the output port of device current mutual inductor receives the current data collection port of this appliance arrangement data processing module, the voltage data of the device data processing module of each equipment harvester gathers the voltage digital amount signal output port that port receives each controller switching equipment of transmission and distribution network respectively, the device current mutual inductor of each equipment harvester is arranged on the transformer output cable of each controller switching equipment of transmission and distribution network respectively,
Described circuit harvester comprises three-phase data processing module, radio-frequency communication module, and for gathering the threephase current transformer of three-phase line current signal, for connecting the wireless communication module of Ethernet, three-phase data processing module is wherein interconnected by the wireless communication module of data line and this device, radio-frequency communication module is interconnected by the wireless communication module of data line and this device, three-phase data processing module has data acquisition port, the output port of threephase current transformer receives the data acquisition port of this device three-phase data processing module, the threephase current transformer of each three-phase harvester is arranged on each three phase line of transmission and distribution network respectively,
Described lightning arrester current collecting device comprises lightning arrester data processing module, radio-frequency communication module, and for gathering the thunder-and lightning protection current transformer of lightning arrester current signal, lightning arrester data processing module is wherein interconnected by the radio-frequency communication module of data line and this device, lightning arrester data processing module has data acquisition port, the output port of thunder-and lightning protection current transformer receives the data acquisition port of this device lightning arrester data processing module, the thunder-and lightning protection current transformer of each lightning arrester current collecting device is arranged on the ground path of each lightning arrester of transmission and distribution network respectively, the radio-frequency communication module of each lightning arrester current collecting device is with its peripheral equipment harvester of radio communication mode wireless connections, the radio-frequency communication module of circuit harvester,
Described locating terminal access network based on ethernet network, the wireless communication module of the wireless communication module of each ground connection harvester, the wireless communication module of each equipment harvester and each circuit harvester, all with the Ethernet at communication access locating terminal place.
Transmission and distribution network fault location system provided by the invention, at each ground path of transmission and distribution network, each controller switching equipment, each three phase line and each lightning arrester, harvester is set with each monitoring node operating mode of Real-time Collection, and be uploaded to locating terminal in real time by radio frequency and wireless ethernet network, locating terminal realizes localization of fault according to the source of image data, malfunctioning node search efficiency can be improved, reduce malfunctioning node and search the time, reduce the human input amount of looking up the fault.
Accompanying drawing explanation
Fig. 1 is the structural representation of the transmission and distribution network fault location system of the embodiment of the present invention;
Fig. 2 is the structural representation of the ground connection harvester in the transmission and distribution network fault location system of the embodiment of the present invention;
Fig. 3 is the structural representation of the equipment harvester in the transmission and distribution network fault location system of the embodiment of the present invention;
Fig. 4 is the structural representation of the circuit harvester in the transmission and distribution network fault location system of the embodiment of the present invention;
Fig. 5 is the structural representation of the lightning arrester current collecting device in the transmission and distribution network fault location system of the embodiment of the present invention.
Embodiment
Illustrate below in conjunction with accompanying drawing and be described in further detail embodiments of the invention, but the present embodiment is not limited to the present invention, every employing analog structure of the present invention and similar change thereof, all should list protection scope of the present invention in.
As Figure 1-Figure 5, a kind of transmission and distribution network fault location system that the embodiment of the present invention provides, it is characterized in that: comprise locating terminal, and multiple ground connection harvester, multiple equipment harvester, multiple circuit harvester, multiple lightning arrester current collecting device;
Described ground connection harvester comprises ground connection data processing module, and for gathering the ground current mutual inductor of current signal on ground path, for connecting the wireless communication module of Ethernet, ground connection data processing module is wherein interconnected by the wireless communication module of data line and this device, ground connection data processing module has data acquisition port, the output port of ground current mutual inductor receives the data acquisition port of this device ground connection data processing module, and the ground current mutual inductor of each ground connection harvester is arranged on each main-transformer ground path of transmission and distribution network respectively;
Described equipment harvester comprises device data processing module, radio-frequency communication module, and for the device current mutual inductor of collecting device line current signal, for connecting the wireless communication module of Ethernet, device data processing module is wherein interconnected by the wireless communication module of data line and this device, radio-frequency communication module is interconnected by the wireless communication module of data line and this device, device data processing module has voltage data and gathers port and current data collection port, the output port of device current mutual inductor receives the current data collection port of this appliance arrangement data processing module, the voltage data of the device data processing module of each equipment harvester gathers the voltage digital amount signal output port that port receives each controller switching equipment of transmission and distribution network respectively, the device current mutual inductor of each equipment harvester is arranged on the transformer output cable of each controller switching equipment of transmission and distribution network respectively,
Described circuit harvester comprises three-phase data processing module, radio-frequency communication module, and for gathering the threephase current transformer of three-phase line current signal, for connecting the wireless communication module of Ethernet, three-phase data processing module is wherein interconnected by the wireless communication module of data line and this device, radio-frequency communication module is interconnected by the wireless communication module of data line and this device, three-phase data processing module has data acquisition port, the output port of threephase current transformer receives the data acquisition port of this device three-phase data processing module, the threephase current transformer of each three-phase harvester is arranged on each three phase line of transmission and distribution network respectively,
Described lightning arrester current collecting device comprises lightning arrester data processing module, radio-frequency communication module, and for gathering the thunder-and lightning protection current transformer of lightning arrester current signal, lightning arrester data processing module is wherein interconnected by the radio-frequency communication module of data line and this device, lightning arrester data processing module has data acquisition port, the output port of thunder-and lightning protection current transformer receives the data acquisition port of this device lightning arrester data processing module, the thunder-and lightning protection current transformer of each lightning arrester current collecting device is arranged on the ground path of each lightning arrester of transmission and distribution network respectively, the radio-frequency communication module of each lightning arrester current collecting device is with its peripheral equipment harvester of radio communication mode wireless connections, the radio-frequency communication module of circuit harvester,
Described locating terminal access network based on ethernet network, the wireless communication module of the wireless communication module of each ground connection harvester, the wireless communication module of each equipment harvester and each circuit harvester, all with the Ethernet at communication access locating terminal place.
The principle of work of the transmission and distribution network fault location system of the embodiment of the present invention is as follows:
Ground connection harvester gathers transmission and distribution network each main-transformer ground path current signal by ground current mutual inductor, and sends to locating terminal by wireless communication module;
Equipment harvester gathers each controller switching equipment output voltage signal of transmission and distribution network, and gathers each controller switching equipment output current signal of transmission and distribution network by device current mutual inductor, then sends to locating terminal by wireless communication module;
Circuit harvester gathers each three-phase line current signal of transmission and distribution network by threephase current transformer, and sends to locating terminal by wireless communication module;
Lightning arrester current collecting device gathers the current signal on each arrester ground circuit of transmission and distribution network by thunder-and lightning protection current transformer, and sent to the radio-frequency communication module of its peripheral equipment harvester, circuit harvester in radio communication mode by radio-frequency communication module, be transmitted to locating terminal by wireless communication module after the radio-frequency communication module of equipment harvester, circuit harvester receives the image data of lightning arrester current collecting device;
Locating terminal is according to each image data received, detect the operating mode of each ground path of transmission and distribution network, each controller switching equipment, each three phase line and each lightning arrester, and after unusual service condition being detected, according to the source (i.e. installation site residing for harvester) of image data, realize localization of fault.
Claims (1)
1. a transmission and distribution network fault location system, is characterized in that: comprise locating terminal, and multiple ground connection harvester, multiple equipment harvester, multiple circuit harvester, multiple lightning arrester current collecting device;
Described ground connection harvester comprises ground connection data processing module, and for gathering the ground current mutual inductor of current signal on ground path, for connecting the wireless communication module of Ethernet, ground connection data processing module is wherein interconnected by the wireless communication module of data line and this device, ground connection data processing module has data acquisition port, the output port of ground current mutual inductor receives the data acquisition port of this device ground connection data processing module, and the ground current mutual inductor of each ground connection harvester is arranged on each main-transformer ground path of transmission and distribution network respectively;
Described equipment harvester comprises device data processing module, radio-frequency communication module, and for the device current mutual inductor of collecting device line current signal, for connecting the wireless communication module of Ethernet, device data processing module is wherein interconnected by the wireless communication module of data line and this device, radio-frequency communication module is interconnected by the wireless communication module of data line and this device, device data processing module has voltage data and gathers port and current data collection port, the output port of device current mutual inductor receives the current data collection port of this appliance arrangement data processing module, the voltage data of the device data processing module of each equipment harvester gathers the voltage digital amount signal output port that port receives each controller switching equipment of transmission and distribution network respectively, the device current mutual inductor of each equipment harvester is arranged on the transformer output cable of each controller switching equipment of transmission and distribution network respectively,
Described circuit harvester comprises three-phase data processing module, radio-frequency communication module, and for gathering the threephase current transformer of three-phase line current signal, for connecting the wireless communication module of Ethernet, three-phase data processing module is wherein interconnected by the wireless communication module of data line and this device, radio-frequency communication module is interconnected by the wireless communication module of data line and this device, three-phase data processing module has data acquisition port, the output port of threephase current transformer receives the data acquisition port of this device three-phase data processing module, the threephase current transformer of each three-phase harvester is arranged on each three phase line of transmission and distribution network respectively,
Described lightning arrester current collecting device comprises lightning arrester data processing module, radio-frequency communication module, and for gathering the thunder-and lightning protection current transformer of lightning arrester current signal, lightning arrester data processing module is wherein interconnected by the radio-frequency communication module of data line and this device, lightning arrester data processing module has data acquisition port, the output port of thunder-and lightning protection current transformer receives the data acquisition port of this device lightning arrester data processing module, the thunder-and lightning protection current transformer of each lightning arrester current collecting device is arranged on the ground path of each lightning arrester of transmission and distribution network respectively, the radio-frequency communication module of each lightning arrester current collecting device is with its peripheral equipment harvester of radio communication mode wireless connections, the radio-frequency communication module of circuit harvester,
Described locating terminal access network based on ethernet network, the wireless communication module of the wireless communication module of each ground connection harvester, the wireless communication module of each equipment harvester and each circuit harvester, all with the Ethernet at communication access locating terminal place.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410638529.6A CN104330704B (en) | 2014-11-13 | 2014-11-13 | Transmission and distribution power grid fault positioning system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410638529.6A CN104330704B (en) | 2014-11-13 | 2014-11-13 | Transmission and distribution power grid fault positioning system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104330704A true CN104330704A (en) | 2015-02-04 |
| CN104330704B CN104330704B (en) | 2017-02-22 |
Family
ID=52405467
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410638529.6A Active CN104330704B (en) | 2014-11-13 | 2014-11-13 | Transmission and distribution power grid fault positioning system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104330704B (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105425107A (en) * | 2015-11-13 | 2016-03-23 | 国网山东省电力公司电力科学研究院 | Method and system for active power distribution network fault diagnosis and location |
| CN106226656A (en) * | 2016-08-30 | 2016-12-14 | 上海萌烨电力科技有限公司 | Distribution network line monitors fault location system in real time |
| CN106841920A (en) * | 2017-02-07 | 2017-06-13 | 上海萌烨电力科技有限公司 | Distribution line real time fail judges and Fault Locating Method |
| CN109470994A (en) * | 2018-11-09 | 2019-03-15 | 南京大贺电力科技有限公司 | Faulty line judgement system and method for power distribution network |
| CN109884380A (en) * | 2019-03-21 | 2019-06-14 | 微山宏瑞电力科技有限公司 | A kind of digital radio detection converter and transmission line of electricity monitoring device |
Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060176631A1 (en) * | 2004-08-05 | 2006-08-10 | Michael Cannon | Remote fault monitoring in power lines |
| CN201047863Y (en) * | 2007-05-30 | 2008-04-16 | 上海龙源智光电力技术有限公司 | GPS clock signal based high voltage capacity equipment insulation online monitoring system |
| CN201780328U (en) * | 2010-08-20 | 2011-03-30 | 万征 | On-line monitoring device for wireless transmission lightning arrester |
| CN102183707A (en) * | 2011-02-21 | 2011-09-14 | 孙映金 | High-pressure grounding on-line monitoring warning device |
| CN202160010U (en) * | 2011-04-29 | 2012-03-07 | 北京世纪德润科技有限公司 | Power line monitoring device based on wireless network |
| CN202661527U (en) * | 2012-04-20 | 2013-01-09 | 山西省电力公司大同供电分公司 | Online detection system for iron core grounding of transformer |
| CN203337759U (en) * | 2013-07-12 | 2013-12-11 | 常州顺创电气科技有限公司 | Online state monitoring system for MOAs (metal oxide arresters) for power transmission line |
| CN203445696U (en) * | 2013-09-06 | 2014-02-19 | 云南电网公司普洱供电局 | Power distribution line online monitoring system |
| CN203745592U (en) * | 2014-01-20 | 2014-07-30 | 湖南云控科技有限公司 | Distributed power grid intelligent monitoring system |
| US20140247055A1 (en) * | 2011-09-29 | 2014-09-04 | Korea Electric Power Corporation | System and method for detecting an abnormal waveform in a power distribution system |
| CN203870191U (en) * | 2014-05-05 | 2014-10-08 | 国电南瑞科技股份有限公司 | Low-voltage line fault locating terminal of power distribution area |
| CN204154852U (en) * | 2014-11-13 | 2015-02-11 | 上海萌烨电力科技有限公司 | Transmission and distribution network fault location system |
-
2014
- 2014-11-13 CN CN201410638529.6A patent/CN104330704B/en active Active
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060176631A1 (en) * | 2004-08-05 | 2006-08-10 | Michael Cannon | Remote fault monitoring in power lines |
| CN201047863Y (en) * | 2007-05-30 | 2008-04-16 | 上海龙源智光电力技术有限公司 | GPS clock signal based high voltage capacity equipment insulation online monitoring system |
| CN201780328U (en) * | 2010-08-20 | 2011-03-30 | 万征 | On-line monitoring device for wireless transmission lightning arrester |
| CN102183707A (en) * | 2011-02-21 | 2011-09-14 | 孙映金 | High-pressure grounding on-line monitoring warning device |
| CN202160010U (en) * | 2011-04-29 | 2012-03-07 | 北京世纪德润科技有限公司 | Power line monitoring device based on wireless network |
| US20140247055A1 (en) * | 2011-09-29 | 2014-09-04 | Korea Electric Power Corporation | System and method for detecting an abnormal waveform in a power distribution system |
| CN202661527U (en) * | 2012-04-20 | 2013-01-09 | 山西省电力公司大同供电分公司 | Online detection system for iron core grounding of transformer |
| CN203337759U (en) * | 2013-07-12 | 2013-12-11 | 常州顺创电气科技有限公司 | Online state monitoring system for MOAs (metal oxide arresters) for power transmission line |
| CN203445696U (en) * | 2013-09-06 | 2014-02-19 | 云南电网公司普洱供电局 | Power distribution line online monitoring system |
| CN203745592U (en) * | 2014-01-20 | 2014-07-30 | 湖南云控科技有限公司 | Distributed power grid intelligent monitoring system |
| CN203870191U (en) * | 2014-05-05 | 2014-10-08 | 国电南瑞科技股份有限公司 | Low-voltage line fault locating terminal of power distribution area |
| CN204154852U (en) * | 2014-11-13 | 2015-02-11 | 上海萌烨电力科技有限公司 | Transmission and distribution network fault location system |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105425107A (en) * | 2015-11-13 | 2016-03-23 | 国网山东省电力公司电力科学研究院 | Method and system for active power distribution network fault diagnosis and location |
| CN105425107B (en) * | 2015-11-13 | 2018-09-28 | 国网山东省电力公司电力科学研究院 | A kind of method and its system of active power distribution network fault diagnosis and location |
| CN106226656A (en) * | 2016-08-30 | 2016-12-14 | 上海萌烨电力科技有限公司 | Distribution network line monitors fault location system in real time |
| CN106841920A (en) * | 2017-02-07 | 2017-06-13 | 上海萌烨电力科技有限公司 | Distribution line real time fail judges and Fault Locating Method |
| CN106841920B (en) * | 2017-02-07 | 2019-07-26 | 上海萌烨电力科技有限公司 | The judgement of distribution line real time fail and Fault Locating Method |
| CN109470994A (en) * | 2018-11-09 | 2019-03-15 | 南京大贺电力科技有限公司 | Faulty line judgement system and method for power distribution network |
| CN109884380A (en) * | 2019-03-21 | 2019-06-14 | 微山宏瑞电力科技有限公司 | A kind of digital radio detection converter and transmission line of electricity monitoring device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104330704B (en) | 2017-02-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP2985613B1 (en) | Method and system for detecting and locating single-phase ground fault on low current grounded power-distribution network | |
| CN104330704A (en) | Transmission and distribution power grid fault positioning system | |
| CN205067643U (en) | Direct current system's of transformer substation distributed insulation monitoring and warning device | |
| CN103558502A (en) | Single-phase earth fault detection circuit, method and system | |
| CN102298106A (en) | FPGA (field programmable gate array)-based arc monitoring system in valve hall | |
| CN103884961A (en) | Cable fault on-line monitoring system | |
| CN203572909U (en) | Single-phase ground fault detection circuit and system | |
| CN104330686A (en) | System for detecting power supply circuit fault | |
| CN103390887A (en) | Method for isolating faults of power distribution system with micro-grid | |
| CN104090208A (en) | Voltage-type power distribution network fault processing method | |
| CN203324364U (en) | Leakage-current early warning system for low-voltage distribution network | |
| CN204154852U (en) | Transmission and distribution network fault location system | |
| CN203673002U (en) | Direct current system earth fault searching device | |
| CN103278733B (en) | A kind of cable grounding remote monitoring method and Long-Range Surveillance System | |
| CN110048383B (en) | Distribution network distributed comprehensive protection system | |
| CN204649821U (en) | A kind of testing circuit of power collection systems | |
| CN106841920B (en) | The judgement of distribution line real time fail and Fault Locating Method | |
| CN202119862U (en) | Electric power circuit fault information display and remote transmission device | |
| CN205982518U (en) | Join in marriage electric network line real time monitoring fault location system | |
| CN202814597U (en) | High-voltage power transmission line temperature measuring system | |
| CN202916375U (en) | Data collection terminal and station area low-voltage zero line current leakage detection system using the same | |
| CN104931859A (en) | Fault monitoring device based on distributed wave recording | |
| CN204789871U (en) | Fault monitoring device based on distributing type record ripples | |
| CN103809060A (en) | Data collection terminal and station area low-voltage zero line current leakage detection system using the same | |
| CN203812997U (en) | Accumulator remote maintenance system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |